The nonlinear optical properties of nematic liquid crystal material have been studied at different concentrations using Z-Scan technique.Experiments are performed using continuous wave (CW) diode solid state laser at 473 nm wavelength and 20 mW power. In this work,six concentrations were prepared for (Di-Cinnamylidene Benzidine), these concentrations were (9×10^-5, 8×10^-5, 7×10^-5, 6×10^-5, 5× 10^-5 and 4×10^-5)M.The optical absorption and transmission spectra for these concentrations were measured by using UV-VIS spectrophotometer. Our results show that the nonlinearity are changed significantly with concentrations, and the capability using the sample as optical limiter device.

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